de.decoit.visa.http.ajax.handlers.DefaultHandler.java Source code

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Here is the source code for de.decoit.visa.http.ajax.handlers.DefaultHandler.java

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/*
 *  Copyright (C) 2013, DECOIT GmbH
 *
 *   This file is part of VISA Topology-Editor.
 *
 *   VISA Topology-Editor is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by the
 *   Free Software Foundation, either version 3 of the License, or (at your option)
 *   any later version.
 *
 *   VISA Topology-Editor is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 *   more details.
 *
 *   You should have received a copy of the GNU General Public License along with
 *   VISA Topology-Editor. If not, see <http://www.gnu.org/licenses/>.
 */

package de.decoit.visa.http.ajax.handlers;

import java.io.IOException;
import java.io.OutputStream;
import org.apache.log4j.Logger;
import org.json.JSONException;
import org.json.JSONObject;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import de.decoit.visa.http.ajax.AJAXServer;

/**
 * This HttpHandler implementation handles AJAX requests with an unknown action.
 * It acts as a super class for all other request handlers.<br>
 * <br>
 * All requests handled by this class are answered with the return message
 * 'ajaxUnknown'.
 *
 * @author Thomas Rix
 * @see AJAXServer
 */
public class DefaultHandler implements HttpHandler {
    private static Logger log = Logger.getLogger(DefaultHandler.class.getName());

    @Override
    public void handle(HttpExchange he) throws IOException {
        log.warn("Unknown AJAX request: " + he.getRequestURI().toString());

        // Fill the response with the error code
        JSONObject rv = new JSONObject();
        try {
            rv.put("status", AJAXServer.AJAX_ERROR_UNKNOWN_REQ);
        } catch (JSONException ex) {
            /* Ignore */
        }

        String response = rv.toString();

        // Send the response
        sendResponse(he, response);
    }

    /**
     * Send a response for the provided HTTP exchange with the content provided
     * in pReponse. Content-Type header will be set to "text/html"
     *
     * @param pHE Object of the HTTP exchange
     * @param pResponse Response content
     * @throws IOException
     */
    protected void sendResponse(HttpExchange pHE, String pResponse) throws IOException {
        StringBuilder sb = new StringBuilder("Sending response: ");
        sb.append(pResponse);
        log.info(sb.toString());

        // Set the content type of the request
        pHE.getResponseHeaders().add("Content-type", "text/html");

        // Send the response headers
        pHE.sendResponseHeaders(200, pResponse.length());

        // Write the actual response to the HttpExchange object
        OutputStream os = pHE.getResponseBody();
        os.write(pResponse.getBytes());
        os.close();
    }
}